The Ohio VS^aturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
Volume III. JANUARY, 1903. No. 3. 
TABLE OF CONTENTS 
Jennings — Some Climatic Conditions of Ohio 339 
Riddle— Fasciation 846 
Cook — T he Development of the Embryo-sac and Embryo of Clavtonia virginica 34!) 
swezey— Life-History Notes on Two Fulgoridte 354 
Wells— Adaptability in Ferns 35S 
Morse— Ohio Reptiles and Batraehinns 3 40 
(.‘la assen — O n Discelium nudum Bride! 361 
( 'la assen — A n Enumeration of the Plants Growing on a Big Erratic Boulder. . . 362 
Griggs— Meeting of the Biological Club 362 
SOME CLIMATIC CONDITIONS OF OHIO. 
otto K. Jennings. 
Plant Ecology has to do with the adaptations and modifications 
of plants to each other and to the outside world. In taking up 
the study of plant ecology it is necessary, therefore, that factors 
external to the plant be taken into consideration. We must study 
the environment of the plant as well as the plant itself. 
Probably a majority of the factors which make up the environ- 
ment of plants and thus have to do with plant ecology fall within 
the domain of meteorology. Light, temperature, wind, and 
moisture ( in its different forms) are all very important ecological 
factors and to their variations both singly and in combination are 
due most of the characteristic differences in the flora of different 
regions. 
Practical workers along the different lines of plant production 
must keep within more or less definite limits determined by me- 
teorological conditions. No farmer, orchardist, or gardener can 
well afford to ignore such things and much less can the ecologist, 
working more or less upon a theoretical basis, expect to accom- 
plish much without taking into account these various metecro- 
logical factors. 
In connection with Prof. Schaffner’s work on the plant ecology 
of Ohio the writer has endeavored to work out the general 
: Read before the Ohio Academy of Science, Nov. 1902, Columbus, Ol io. 
